Duralyn 400mg Capsule CR
By Duralyn
Rx
10 Capsule CR in a Strip

Composition
Theophylline(400mg)

Manufacturer - Raptakos Brett & Co Ltd
253, Dr Annie Besant Road, Worli, Mumbai – 400 030, India.

Expires on or after
June, 2026
About Duralyn 400mg Capsule CR
Duralyn 400mg Capsule CR is a medication used for managing asthma and chronic obstructive pulmonary disorder (COPD), a condition that obstructs the airflow to the lungs. This medicine works by relaxing the muscles in the air passages, which helps widen them, making it easier to breathe. It is essential to take Duralyn 400mg Capsule CR with food in the evening and at the same time every day to optimize its benefits. Your doctor will determine the appropriate dosage and frequency based on your specific needs. Be sure to adhere to the prescribed regimen without missing any doses.
In case you inadvertently miss a dose, take it as soon as you remember. It is important to note that Duralyn 400mg Capsule CR does not provide immediate relief for breathing difficulties or prevent ongoing breathing issues. Therefore, it is recommended to always carry a medical inhaler for emergency situations. Common side effects of this medication may include vomiting, headache, nausea, stomach upset, and insomnia. If these side effects become bothersome or severe, consult your doctor for advice on managing or preventing them.
It is generally advised to refrain from consuming alcohol or smoking while taking Duralyn 400mg Capsule CR. Additionally, avoiding highly caffeinated products like coffee, tea, and dark chocolate is recommended as they can potentially amplify the side effects of the medication. Before starting treatment with this medicine, inform your doctor if you have kidney or liver disease, heart-related issues, or if you are pregnant or breastfeeding. Your doctor should also be aware of all other medications you are currently taking to prevent any potential interactions that may reduce the effectiveness of Duralyn 400mg Capsule CR.
Benefits
Duralyn 400mg Capsule CR offers key benefits for individuals dealing with Chronic obstructive pulmonary disease (COPD) and Asthma. In the case of COPD, this medication helps keep the airways in the lungs open by relaxing the muscles, making it easier for air to flow in and out. This results in relief from symptoms like tightness in the chest, shortness of breath, wheezing, and coughing. By using Duralyn 400mg Capsule CR, individuals can carry out their daily activities more comfortably. The medication is known for its safety and effectiveness, with quick onset of action and lasting effects for up to several hours.
Moreover, in the treatment and prevention of Asthma, Duralyn 400mg Capsule CR plays a crucial role. It can effectively prevent asthma attacks when taken before exercise or exposure to triggers such as house dust, pollen, pets, or cigarette smoke. By using this medication, individuals can engage in physical activities without the fear of triggering symptoms like wheezing, coughing, and shortness of breath. This allows them to lead a more active lifestyle and reduces the worry of experiencing asthma symptoms due to environmental factors.
Overall, Duralyn 400mg Capsule CR provides significant benefits for individuals dealing with COPD and Asthma by improving lung function, easing symptoms, and enabling a better quality of life with reduced restrictions due to respiratory conditions. It is a reliable and effective treatment option that can make daily activities and physical exercise more manageable and enjoyable for those affected by these pulmonary diseases.
How to use the Duralyn 400mg Capsule CR
To use Duralyn 400mg Capsule CR, follow your doctor's instructions on the dosage and duration of treatment. Swallow the capsule whole with water, without chewing, crushing, or breaking it. You can take Duralyn 400mg Capsule CR with or without food, but it is recommended to take it at the same time every day for best results. Following these simple steps will help you effectively incorporate Duralyn 400mg Capsule CR into your daily routine and maximize its benefits. Remember, it is important to adhere to your doctor's guidance for safe and effective use of this medication.
Uses of Duralyn 400mg Capsule CR
Duralyn 400mg Capsule CR is commonly used for the treatment of Chronic Obstructive Pulmonary Disease (COPD) and for both the treatment and prevention of Asthma. It works by helping to relax the muscles in the airways, making it easier to breathe for individuals suffering from these conditions. By providing relief for symptoms such as shortness of breath, wheezing, and coughing, Duralyn 400mg Capsule CR plays a vital role in managing COPD and Asthma effectively. It is essential to follow the prescribed dosage and usage instructions provided by a healthcare professional to ensure the best outcome from using this medication.
What conditions Duralyn 400mg Capsule CR treats?
Duralyn 400mg Capsule CR is used to treat and prevent symptoms of asthma and chronic obstructive pulmonary disease (COPD). For COPD, this medication helps keep the airways open by relaxing the muscles, making it easier to breathe and relieving chest tightness, shortness of breath, wheezing, and coughing. It is effective within minutes and can last for several hours. In asthma, it can prevent asthma attacks triggered by activities like exercise or exposure to allergens, allowing for freer movement without worrying about symptoms. It enables a more worry-free lifestyle for individuals with asthma or COPD.
Should you consult a doctor?
If you experience persistent or severe side effects such as vomiting, headache, nausea, upset stomach, or insomnia while taking Duralyn 400mg Capsule CR, it is important to seek medical assistance promptly. Additionally, if you have kidney or liver disease, heart-related problems, or if you are pregnant or breastfeeding, inform your doctor before starting the treatment. It is crucial to consult your healthcare provider if any concerns arise regarding the medication or if the side effects persist despite your body adjusting to the medicine. Remember to take your prescribed dose at the same time daily, carry a medical inhaler for emergencies, and avoid alcohol, smoking, and highly caffeinated products like coffee and tea during the treatment period. Your doctor will determine the appropriate dosage and duration based on your condition to ensure optimal symptom improvement.
Side effects of Duralyn 400mg Capsule CR
When taking Duralyn 400mg Capsule CR, you may experience some side effects. Most of these side effects are not serious and tend to go away on their own as your body gets used to the medication. However, if these side effects linger or if you are concerned about them, it is advisable to consult your doctor. Common side effects of Duralyn 400mg Capsule CR include vomiting, headache, nausea, upset stomach, and difficulty sleeping (insomnia). If you experience any of these side effects, it is important to seek guidance from your healthcare provider.
Safety advice

liver
When taking Duralyn 400mg Capsule CR, it's important to be cautious if you have liver disease. Patients with liver issues may require a dose adjustment when using Duralyn 400mg Capsule CR. Make sure to consult your doctor for guidance on how to safely use this medication.

kidney
Duralyn 400mg Capsule CR is safe for use in patients with kidney disease. There is no need to adjust the dose of Duralyn 400mg Capsule CR for kidney-related issues.

alcohol
It is not safe to drink alcohol while taking Duralyn 400mg Capsule CR. Consult your doctor when consuming alcohol with Duralyn 400mg Capsule CR.

driving
Duralyn 400mg Capsule CR typically does not impact your driving ability. Drive carefully.

pregnancy
Duralyn 400mg Capsule CR is not recommended for use during pregnancy, as animal studies suggest potential harm to the developing baby. Your doctor will assess the risks and benefits before prescribing this medication. Kindly consult your doctor for further guidance.

breastfeeding
Duralyn 400mg Capsule CR is safe to use while breastfeeding. Studies show minimal drug transfer to breastmilk, reducing harm to the baby. Wait 2-4 hours after taking the capsule to lower medicine exposure to your baby.
Consumption warning before consuming Duralyn 400mg Capsule CR
Before consuming Duralyn 400mg Capsule CR, please take note of the following important information. This medication is typically used to manage symptoms of asthma and chronic obstructive pulmonary disorder (COPD). It works by relaxing the muscles in the air passages, allowing for easier breathing. To ensure the best results, it is recommended to take Duralyn 400mg Capsule CR with food in the evening at the same time daily as prescribed by your doctor. Missing a dose should be avoided, but if it happens, take it as soon as you remember.
Common side effects of this medicine may include vomiting, headache, nausea, stomach upset, and insomnia. If these side effects become bothersome or severe, it is essential to inform your doctor. To optimize the medication's effectiveness, it is advised to refrain from consuming alcohol, smoking, or high-caffeinated products like coffee, tea, and dark chocolates.
It is crucial to disclose any existing kidney or liver conditions, heart-related issues, pregnancy, or breastfeeding status to your doctor before starting Duralyn 400mg Capsule CR. Additionally, inform your healthcare provider about all other medications you are taking to prevent any potential interactions. Remember that this medication does not provide immediate relief during breathing difficulties, so always have your medical inhaler on hand for emergencies.
Related lab tests
When taking Duralyn 400mg Capsule CR, it is important to monitor certain lab tests to ensure the medication is being tolerated well by the body. One important test to consider is the Absolute Eosinophil Count, which measures the levels of a type of white blood cell that can indicate allergic reactions or parasitic infections. Keeping an eye on this count can help detect any potential issues early on. Additionally, a Complete Blood Count is recommended to assess overall blood health, including red and white blood cell counts, hemoglobin levels, and platelet counts. This comprehensive test can provide important insight into how the body is responding to the medication. Regular monitoring of these lab tests can help healthcare providers track the effects of Duralyn 400mg Capsule CR and ensure the patient's well-being.
Additional Information
| Habit Forming | No |
| Chemical Class | Xanthine Derivative |
| Therapeutic Class | RESPIRATORY |
| Action Class | Theophylline & its derivatives |
FAQs
Disclaimer
The information provided on this website is to the best of our abilities to ensure it is accurate, reliable, and reviewed by a team of professionals. It should not be used to diagnose, prevent, or cure any health problem. The information presented here is not intended to create a doctor-patient relationship or replace a registered medical practitioner's advice, diagnosis, or treatment. The absence or provision of any information or warning regarding any medicine should not be assumed as an implied or explicit assurance of safety or efficacy. We highly recommend consulting your registered medical practitioner for all queries or doubts related to your medical condition. Do not ignore professional medical advice or delay seeking it based on the content encountered on our website. We intend to support, not replace, the doctor-patient relationship.
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Content verified by

Dr. Upasana Bhatia
MBBS - General Medicine
Last update on 11-Feb-2025
